|2.||Also: PD per diem|
|—the chemical symbol for|
The symbol for the element palladium.
The symbol for palladium.
|palladium (pə-lā'dē-əm) Pronunciation Key
A malleable, ductile, grayish-white metallic element that occurs naturally with platinum. It is used as a catalyst in hydrogenation and in alloys for making electrical contacts and jewelry. Atomic number 46; atomic weight 106.4; melting point 1,552°C; boiling point 3,140°C; specific gravity 12.02 (20°C); valence 2, 3, 4. See Periodic Table.
PD/P-D/ adj. [common] Abbreviation for `public domain', applied to software distributed over Usenet and from Internet archive sites. Much of this software is not in fact public domain in the legal sense but travels under various copyrights granting reproduction and use rights to anyone who can snarf a copy. See copyleft.